Endurance MTB Events

I'm trying to plan which races to do this year and I'm looking to focus on endurance Events. Ideally, a 6hr, a couple of 12hrs and one 24hr.
I've looked at the obvious ones, (Mayhem, Exposure, Gorrick) but wondered if anyone had any other recommendations, especially for 6hr races.

The Glentress Seven is almost a six- excellent atmosphere and interesting tracks, it's not really my sort of thing but I really enjoyed it each time, soloing this year which I may regret. The only downside is that it's made me susceptible to doing a Ten again which I'm sure I'd regret

chris-noble-mtb.blogspot.co.uk/as above really, we don't have a huge selection in this country, highlighly recommend Erlestoke 12, some of the best singletrack in all the races I do, and not hugely subsribed so less overtaking efforts required. I'm hoping to do the Whinlatter challenge this year, although that is lap based, just slightly longer. I'd quite like a return of Kielder 100, but we shall see

Xcalibre also has a ridiculously crap website that tells nothing of what the event actually is!!!! Surely the ladybird book of web pages says "Page one- Eye catching epic-sounding spiel to get people drinking the cool-aid"

The good news is that the OMM are still trying to keep Polaris alive, and if they sort out their web site I'll be signing up again. They did a really good job in 2012 running a full Polaris style event with a wilderness campsite, alongside a shorter course returning to the start point at end of day one.

At the moment the details on the web site look too much like they have been copied from the running OMM event, but I'm hoping they'll sort that out soon. They are planning on both Spring and Autumn events.

crosshair » Xcalibre also has a ridiculously crap website that tells nothing of what the event actually is!!!! Surely the ladybird book of web pages says "Page one- Eye catching epic-sounding spiel to get people drinking the cool-aid"
So what is it?